RFR: 8357592: Update output parsing in test/jdk/sun/security/tools/jarsigner/compatibility/Compatibility.java

[Matthew Donovan]

In this PR, I updated the jarsigner compatibility test to handle minor differences in the output of jarsigner between versions.

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Commit messages:
 - 8357592: Update output parsing in test/jdk/sun/security/tools/jarsigner/compatibility/Compatibility.java

Changes: https://git.openjdk.org/jdk/pull/25403/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25403&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357592
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25403.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25403/head:pull/25403

PR: https://git.openjdk.org/jdk/pull/25403